Method and structure of boiler baffles



J. A. M DOWELL METHOD AND STRUCTURE OF BOILER BAFFLES Filed May 26, 1926 Patented Get. 5, 1926.

unites STATES JOHN A. MAGDOWELL, OF ST. LOUIS, MISSOURI.

METHOD AND STRUCTURE OF BOILER BAFFLES.

Application filed May 26,- 1926. SeriaI-No. 111,6S7.

This invention relates to improvements in the construction of baflle or fire Walls for water tube, boilers,

The

or'imar ob ert of the invention is to l a 1 show a method of constructing a battle wall which in its. installation includes Closely litting and fire-proof sealing bonds wall and the enclosed joints between the for the tubes, whereby so long as the structure re-,

mains undisturbed, circuiting of the heat leakage or short heat currents through those becomes necessary to r for replacement or repair,

wisting and ily done y merely t emove the said tubes this may be readpulhng the tubes, whereby the said bonds are ruptured without rupturing the wall proper, after which the tubes may be withdrawn.

A furthfir object is. tical embodiment of th in the form of an actu to set. forth a prace method referred to, al baffle wall built in accord with the said method.

In the drawing H 1 1 a D i igure ieprcscn through a portion of a ts a cross; section water tube boiler and through the corresponding portion of. a ball-re wall constructed therein 1n accordance with this inventio Figure 2 1s a longitu a portion of the boiler J5 igure 3 tile of or form well plif n; dinal section through and wall;

is a detail of a battle wall block adapted to the-exem- LitttlOIl of this invention.

In carrying out this invention I provide baffle tiles: 1 made of fire clay or the, like and formed with oppositely disposed, arcuate or semi-circular cut-outs 2 adapted to engage and embrace boiler tubes 3.

at I opposite side the The arcuate margins of the cut-outs 2 are tapered or beveled to comparatively fine or thin and frangible edges,

as shown at at, and the provision of these tapered or beveled constitutes one of my invention. gins of the tiles opposite faces of the tively blunt edges, as

the

edges upon the said tile,

essential features of lhe other two opposite marmay be also beveled off at tiles and to comparashown at 5 and 6 to form laps, as described in the co-pending application of the pre sent applicant.

In constructing a battle wall 7 I first coat the tubes 3, in the plane of the proposed wall, with substantial coating or bonds 8 of lime, mortar, or any other form of mortar which will be plastic in application, siccative after the application, and incombustile and friable after the same has set. These sealing bonds are laid on to the thick ness of approximately one-eighth of an inch over the entire circumferences of the tubes, and for a length corresponding to the thickness of the proposed wall, exclusive of the thickness of the tiles 1' to be used at each side of that wall.

I next erett spaced wall shells 9 at each side of the space defined by the coatings or bonds 8, and at the ends of those coatings, by filling in with the tile 1 between the tubes 3. For this purpose the cut-outs 2 are placed in lateral engagement with adjacent ones of the tubes, with the upper tiles successively overlap sing the lower ones, and with the lower laps 1O directed inwardly, as shown in Figure 2. In this operation the fine edges l of the cut-outs are turned inwardly and are crowded well up against the ends of the coatings or bonds 8 imposed upon the tube 3 as aforesaid. In building up the said shells, the tiles should of course be accurately aligned with each other, in transverse parallel planes relative to the boiler tubes. After the coatings 8 have dried, set or hardened sufficiently to bear the weight or pressure without injury to the coatings, any desired viscuous or plastic, siccative and incomlnistible filler, as for instance, plastic fire clay as represented at ll, may be poured in at the top of the structure and allowed to flow down and fill the spaces between the two shells. Owing to the inwardly overlapped relation of the tiles, the plastic tiller will not work out between them. It is essential that used in providing the coatings or bonds 8 should be of some friable or crumbly, as well as incombustible material, such as lime, so that after the coatings harden, they will effectually seal the joints between the tubes and wall against the short circuiting of heat currents, but may be nevertheless easily ruptured and broken whenever it may be desired to remove any of the tubes 3. When this event occurs and it is desired to remove any one of the tubes for repair or replacement, this may be readily accomplished by turning, twisting and pulling upon the tube, thereby breaking and crumbling the encircling edges 4 of the tiles, and also the friable bond 8 between the tube the mortar f first coating the tubes in the and the wall proper, after which the tube may be easily withdrawn. When the tube is replaced, the joint between the tube and wall may be again sealed with a similar lime mortar or paste. The two essential features of this method, therefore, consist in the provision of spaced bafi'le wall shells which contact with the water tubes through their tapered, beveled or reduced and relatively frangible edges; and friable and incombustible bonds interposed between the surfaces of the tubes within the said shells and the wall proper which is filled in between the said shells.

And while I have herein set forth and described my method with a certain particularity of structural detail, it is understood that I may vary the said details as may seem practicable or expedient, without departing from the spirit of my invention, as defined in the appended claims.

I claim:

1. The method of constructing a baffle Wall for a water tube boiler, consisting in plane of the proposed wall and for lengths approximately equal to the thickness of the wall with sealing bonds of material which will be plastic in the application, siccative after the application and incombustible and friable after the same has set; then erecting spaced wall shells at each side of the space defined by the said bonds, the said shells being provided with tapered and relatively frangible edges at their points of contact with the said tubes; and after the said bonds have set, filling in the spaces between the shells with a plastic, siccative and incombustible material.

2. The method of constructing a bafiie wall for a water tube boiler, consisting in coating the tubes in the plane of the proposed wall for lengths approximately equal to the thickness of the wall, with coatings of friable and incombustible material; erecting spaced wall shells at each side of the space defined by the said coatings, the said shells being composed of tiles having semicircular cut-outs adapted to embrace adjacent water tubes, the margins of the said outouts being reduced to relatively thin and frangible edges adapted to contact with the said tubes; and then filling in the spaces between the shells with some viscuous, siccative and incombustible material.

3. In a baffie wall for a Water tube boiler,

spaced shells for the said wall, the said shells having semi-circular, tapered and relatively frangible edges contacting with the water tubes.

4. In a battle wall for a water tube boiler, incombustible and friable bonds for the joints between the wall and the boiler tubes.

5. In a bafile wall for a water tube boiler,

tube boiler, spaced wall shells arranged transversely of the tubes and haviflg reduced and relatively frangible edges contacting with the tubes.

8. In a batlle wall structure for a water tube boiler, friable and incombustible sealing bonds interposed at the joints of the tubes and the wall, and separating the tubes from the wall proper.

9. A form of tile for building a battle wall for a water tube boiler, the same consisting of .a flat formation of frangible material, having an arcuate cut-out at one of its margins for engaging one of the water tubes, the said margin at the said cut-out being reduced to a relatively thin edge adapted to contact with the water tube.

In testimony whereof I afiix my signature.

JOHN A. MAODOVVELL. 

